Chris welcomes the viewer to Sesame Street, as he serves Telly his lunch: a grilled-cheese sandwich, which is cut into Telly's favorite shape: a triangle. Suddenly, heroic music plays as Minnesota Mel, a swashbuckling hero, makes a swinging entrance. He's on one of his "patented high-stakes adventures," this time in search of the Golden Triangle of Destiny (the very mention of which always cues a sting). It is "the rarest, most beautiful triangle" in the world, which only one person has seen -- and taken a picture of. Telly and Chris are impressed at the sight of the golden sides and the "blinged-out" angles. Legend has it that this magnificent triangle is hidden somewhere on Sesame Street, but just as Mel goes off to find it, he gets a charley-horse and is unable to continue his journey. Telly refuses to wait until Mel gets better, so, being the triangle lover he is, he decides to find the triangle himself, emerging in explorer gear in a split-second, calling himself "Texas Telly" (he's not from Texas, but he likes cows).

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Telly calls out for the triangle, but the garage doors open, and out rolls a giant boulder! He and Chris run away from it in faux slow motion, until it talks to them, revealing that it has a clue to find the triangle. The clue is: they have to look under something.

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Telly looks under a picnic table, then under Chris, then under the ground (using a jackhammer). Chris tells him he won't find anything underground, but just then, he comes across something shiny: a jewel-encrusted shape with five sides and five angles. This turns out to be the Golden Pentagon of Destiny, which was sought after by Wyoming Walt, another intrepid explorer. Walt takes the pentagon, and leaves for a vacation ("If anyone calls, tell them Wyoming's in Hawaii!").

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Telly's next clue is given to him by a snake, which is: "laundromat." Chris points him to the laundromat, and they immediately head there.

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At the laundromat, Murray Monster shows Leela that he has four socks, and she observes that they don't match. Just then, Texas Telly swings into the laundromat. Murray, already a big fan of his, helps him look under several laundry baskets and piles, making a mess of the place for Leela to clean.

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Telly feels like giving up, until Murray points him out to a mysterious-looking bottle of fabric softener, which may be a trap. Telly feels nervous at first, but he bravely goes forth to the bottle. Under it, he finds another jewel-encrusted shape, and soon, the laundromat starts to quake, and he runs away in terror as clothes spring out of the washing machines. He makes it back safely, and notices that this shape has eight sides and eight angles ... which means it's an octagon. But it's not just any octagon: it's the Golden Octagon of Destiny, sought after by Virginia Virginia. She takes the octagon, and goes on her way.

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Now Telly really feels like giving up on this quest and is even tired of the triangle music he hears every time he mentions it. He goes to another corner of the laundromat, and sits down in an armchair. He feels something poking him from underneath, so he checks under the seat cushion and finds ... The Golden Triangle of Destiny! They all count the sides and angles to make sure it's the right one. Just then, Minnesota Mel enters the laundromat, and tries to claim credit for finding the triangle. Telly, however, says it belongs to the Museum of Triangular History, where everyone can see it. And so ends the adventure of Minnesota Mel and Texas Telly and the Golden Triangle of Destiny!

Abby's Flying Fairy SchoolPlaytime is over for the students and they must clean up. Blögg doesn’t want to put his toys away, so he decides to sweep them under the magic carpet. However, a magic lock is on it. Once unlocked (using Niblet’s horn), a hoard of Fairy Dust Bunnies are unleashed. Unfortunately, Mrs. Sparklenose is allergic to the dust bunnies and once they come in contact with her, her nose sparkles and blinks once. She sneezes and turns the students into frogs. They make up a magic word to return them back to normal (Gezundenshniffle). Her nose blinks twice now, turning them into chickens. They realize they have to say their word for every time her nose blinks to return to normal. Her nose blinks thrice and they turn into cheese and are then chased by a hungry Niblet. After returning to normal, they call on Spot, who shows them a video of a robot “under” various things. They see that to get the dust bunnies gone, they need to go back under the rug. They make a dust carrot and sends the dust bunnies back under. Blogg, however, is stuck cleaning up his toys.(First: Episode 4197)

Muppets

Murray announces Bert and Ernie's Great Adventures is coming, but first, he counts 12 kids and a dozen eggs.(First: Episode 4200)

Bert and Ernie's Great AdventuresDuck-Detectives Bert and Ernie are called upon by Veronica Lambshank to investigate the strange behaviors of her friend, Malty, who claims to be a "Maltese duck". Bert and Ernie disguise themselves as Veronica’s sheep cousins and meet them by the pond. Rubber Duckie suggests that they get Malty to swim, and then maybe he’ll quack. Ernie pushes Bert in the pond and Malty saves him, but he does not quack and flies off. Later, they follow him through the town and listen for him after loosing his. They also find Veronica has followed them. They hear whistling and follow the sound, leading to Malty’s house. He confesses to being a Black-Bellied Whistling Duck, and explains he pretended to be a Maltese duck so she would be his friend. They all celebrate by whistling.(First: Episode 4187)